1977

1. Collaborative Research CenterSFB 477Life Cycle Assessment of Structuresvia innovative Monitoring The costs for preservation and rehabilitation etc. are increasing substantially. In Germany: value of all buildings is approximately 25,000 bill. $. Assuming a mean life cycle of about 100 years 2,500 billion $ are needed year by year for reinvestment. 100 80 Using intelligent monitoring procedures, the service life of structures can be extended considerably, or they can be rehabilitated or put to new uses in a way which conventional standards would never permit. 60 40 20 0 1977 1985 1995 2005 New Buildings costs Renovation costs • Participants of the Collaborative Research Center are working in the fields of: • Civil engineering m Chemistry • Geodesy m Chemical Engineering • Mechanical engineering mBiotechnology • Electrical engineering mPhysics and Metrology • To cover the wide scope of civil engineering structures, the work focuses on projects in: • Structural EngineeringLandfills Bridges Cranes Towers Masts Tanks Containments...... Mast collapse after fatigue damage Landfill, schematic Biochemical processes Sealing problems Subsoil ....... Contamination ......

2. Project Field A: Methods and Strategies • Fundamental aspects of structural monitoring such as: • Cause, origin and development of damages • Set-up of damage catalogues • Weak points and risk analysis • Damage indicators (symptoms) • Failure paths, fault trees, limit states • Reliability: probabilistic - deterministic approach • Economic efficiency of monitoring measures • Project Field B: Adaptive Models • Development and validation of adaptive models: • Mechanical (static / dynamic) models • Damage models for different materials • Physical and chemical processes in concrete structures • Biological and biochemical processes (landfill) • Multiphase Flow, Multicomponent Transport in Landfill • Project Field C: Sensors, Development, Adaptation • Development, improvement and adaptation of sensors for: • Mechanical processes • Physical and chemical processes, Corrosion monitoring • Biochemical processes • Reliability under long term use. Examples: • Micro-Magnetic Sensor 3D Strain Sensor Moisture Sensors Fatigue Damage FE-Approach Landfill: Scaling Problems Project Field D: Tests on Structures focuses on realistic measurements on real structures, in which the strategies, methods and sensors developed in Project Fields A, B, C are tested under realistic conditions. m Buildings- and Structures: Fatigue, Corrosion, Carbonatisation, Life Cycle m Landfill:Leakage, qualities inside drainpipes, gasproduction, deformations Technical University Carolo-Wilhelmina, Braunschweig - Germany Chairman: Prof. Dr.-Ing. Udo Peil • Institut fuer Stahlbau • Beethovenstr. 51 • D‑38106 Braunschweig • Germany Tel: +49 531 391 3379 • Fax: +49 531 391 4592 • email: u.peil@tu-bs.de or sfb477@tu-bs.de www.sfb477.tu-bs.de